.box {
  display: flex;
}

.box > ul {
  height: 88px;
  margin-top: 50px;
  padding-right: 10px;
  border-right: 1px solid #ccc;
}

.box > ul > li {
  cursor: pointer;
  margin-bottom: 10px;
  padding: 5px;
}

.box > ul > li.active {
  background-color: skyblue;
  color: #fff;
}

.box > form {
  display: none;
}

.box > form.active {
  display: flex;
}